Four groups of 15-19 adult ISA Brown hens were studied in pens to assess the relationship between social status and use of perches and nestboxes. This was to test the hypothesis that subordinate hens use these resources more by day, for avoiding dominants, but that dominants use perches more at night, for roosting. The experiment consisted of a 5-week pre-treatment period, when no perches were ...

This paper presents a practical solution to the guidance of a unicycle type robot, including path following, obstacle avoidance and the respect of wheeled actuation saturation constraint, without planning procedure. These results are based on an extension of previous results on path following control including actuation saturation constraints. New solution for obstacle avoidance, with guarantee...

This article provides a review of selected literature of nonhuman primates in the subsistence and symbolism of indigenous lowland South American groups. While few works have focused specifically on the relationship between human and nonhuman primates in Amazonia and the surrounding areas, a number of ethnographic works do incorporate information about the roles of monkeys in varied groups. The ...

P r ~ i o u s LUC of arr$cial pountiab has dononraolcd the need for an oinmcle moidwue p o r e d that closely mo&L he obstacle. ye1 docr not pnworr lord minim0 in the wontrpocc of rhr manipuhror. Recentty we proposed a new ellipticd porcrdolfwvrion which &fis hesc rcquirenunu for rectongrhu objects in spherically synuncrric amocdvc wells. In rhir paper we present a ntw obstacle avoidwue porenri...

Exaggerated avoidance behavior is a predominant symptom in all anxiety disorders and its degree often parallels the development and persistence of these conditions. Both human and non-human animal studies suggest that individual differences as well as various contextual cues may impact avoidance behavior. Specifically, we have recently shown that female sex and inhibited temperament, two anxiet...

I sometimes see them in my dreams. The colorful peaks and troughs, the sharp, crisp waves spread across my computer screen, the rolling nitrogenous mountains, each with its own nucleotide sitting solidly on the summit. I’m talking about electropherograms, of course. Remember them? Those beautiful but oh so “oldgen” bioinformatics data generated from automated Sanger sequencing machines, such as...

the central cholinergic system has been associated with cognitive function and memory and acetylcholine plays an important role during the early stages of memory consolidation. in this study, after training mice were tested with one way active avoidance procedure and retention were tested at 4, 8, 12, 16 and 24 hours of training and compared with non-shocked mice, in which it took 24 hours, a s...

introduction mdma or ecstasy is a derivative of amphetamines used mostly by young people worldwide. although the acute effects of this drug are known, the effect of chronic administration is not well studied. therefor the aim of this study was to determine the effects of repeated (long term) administration of mdma on rats' memory and their hippocampal cell density. method: young adult male...